This design includes elements from various tutorials in addition what my daughter and I thought would look best for her stethoscope. The finished width of the main piece allows it to just fit over a bell that is 2 inches in diameter.
1/4 yard 100% cotton or cotton blend fabric (WOF, not a fat quarter)
3/4 inch wide Velcro tape
7/16 inch snap fastener (I used Dritz)
5.75 inches wide by 27.5 inches long - 1 piece
1.50 inches wide by 3.25 inches long - 2 pieces (this is the tab)
1/2 inch wide Velcro piece
Pin Velcro on right side of fabric 1/2 inch inch from the top and sides. Sew close to the edge of the Velcro on all 4 sides.
With both tab pieces right sides together sew around 3 sides and trim top corners.
Turn right side out, press with iron and top stitch 1/8 inch around 3 sides leaving raw edge open.
Fold a short end up on the wrong side of the fabric 1/4 inch and press. Fold another 1/4 inch up and press again. Top stitch to secure in place.
With right side of base fabric facing up, place the second piece of Velcro 1 inch from the side and 3/4 inch up from the bottom on the left side of the fabric. Sew close to the edge of the Velcro on all 4 sides.
With Velcro side of tab piece facing down pin tab on the right side of the base fabric 1/2 inch up from the base and baste in place.
Fold on long side with right sides together and sew, using a 1/4 inch seam, starting from the folded edge up 22.50 inches. Back stitch to secure at top. Turn piece right side out.
Fold rest of long side raw edges 1/4 inch onto the wrong side and press. Top stitch to hold in place.
Fold top part (this has the raw edges) right sides together and sew a 1/4 inch seam on the top. Turn right side out. Press down and then sew along the previous stitch line across the width.
Follow the snap directions to install snaps as shown below.